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APPENDIX. 



similarity, in many respects, of the ornithology of that region 

 with that of Europe. With this intention, therefore, he had now 

 to lay before the Society three species, bearing a striking resem- 

 blance to the European, viz. Saxicold rubicola, Sturnus vulgaris 

 after second moult, the bird in full plumage having been already 

 exhibited, and Sitta Europcea ; the last differing, however, in 

 being of a deeper colour below. A fourth species was produced 

 very nearly allied to the Sitta Europcea, which, however, present- 

 ed characters sufficiently marked to form a new species ; and 

 from the banded tail being the most prominent, the Professor 

 gave to it the specific name of vitticauda. A specimen of the 

 Sitta frontalis from Northern India was also exhibited, and its 

 wide geographic distribution pointed out, it being first found in 

 Java, and described by Dr Horsfield. 



3. It was mentioned, that the very remarkable fact of the ex- 

 pansion of liquefied carbonic acid, lately observed by the French 

 academicians, has been fully verified by Mr Kemp, lecturer on 

 chemistry, who finds that the expansion is not peculiar to this 

 liquefied gas, but belongs to all other gases in the liquid state. 

 At this meeting of the Society, Mr Kemp exhibited a specimen 

 of the liquefied sulphurous acid gas, hermetically sealed in a 

 glass tube, and separated from the materials from which it had 

 been generated. This specimen of the liquefied gas occupied 8 

 inches of a tube, 5-8ths of an inch in internal diameter, and when 

 cooled from the temperature of 60° down to 14° of Fahr., or the 

 point at which it becomes liquid under the ordinary pressure of 

 the atmosphere, it contracted one inch, but when heated an equal 

 number of degrees above 60°, viz. 46°, it expanded through a 

 greater distance than it had before contracted by the abstraction 

 of an equal amount of caloric, shewing that the expansion went 

 on at higher temperatures in a slightly increasing ratio, so that 

 the expansion between its liquefying point, viz. 14° and 212°, 

 the boiling point of water, is nearly one-third of its whole vo- 

 lume, the pressure against the expansion being at 212°, about 25 



